CVE tracker / CVE-2026-68800
CVE-2026-68800
CVE-2026-68800 is the Microsoft Excel Remote Code Execution Vulnerability. Microsoft rates it Important, CVSS 7.8. It is not in CISA's Known Exploited Vulnerabilities catalog. Published August 11, 2026.
Risk summary
HighRemote Code Execution
7.8
CVSS v3 base
0.5%
EPSS: chance of exploitation in 30 days
High
Severity
Important
Microsoft's rating
Less Likely
Microsoft: exploitation
No
In CISA KEV
Microsoft describes it: “Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code locally.”
How to fix it
Microsoft lists 14 affected products and the update that fixes each:
- KB5002884 · fixed build 16.0.10417.20175
Office Online Server - KB5002903 · fixed build 16.0.5565.1001
Microsoft Excel 2016 (64-bit edition), Microsoft Excel 2016 (32-bit edition) - Click to Run
Microsoft Office LTSC 2024 for 64-bit editions, Microsoft Office LTSC 2024 for 32-bit editions, Microsoft Office LTSC 2021 for 32-bit editions, Microsoft Office LTSC 2021 for 64-bit editions, Microsoft 365 Apps for Enterprise for 64-bit Systems, and 3 more - Release Notes · fixed build 16.112.26081010
Microsoft Office LTSC for Mac 2024, Microsoft Office LTSC for Mac 2021, Microsoft Office 365 for Mac
What Microsoft changed
- August 11, 2026: Information published.
Details
- Weakness
- CWE-122: Heap-based Buffer Overflow
- Publicly disclosed (Microsoft)
- No
- Exploited (Microsoft)
- No
- Known exploited (CISA KEV)
- Not listed
- Published
- August 11, 2026
- Last revised
- August 11, 2026
Get told when this changes
Senserva Watch emails Microsoft security and patch alerts when something moves: a new exploitation report, a revised fix, a known issue. Free, one email address.
References
From Microsoft, CISA, NVD and FIRST data; the Microsoft details were read when this page was opened. Check the references above before you act.